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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd6ba6d54a6424221c539efc3c4f3af364a018ad9499a6390be759e91b87d669' 
  AND token = '91doaLT8HJlfl684lZ7h7AjrIUhFrOX7ip8Kcry99fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}