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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5212919b4c588e93af020e86424fffc34cbb6c7b1e8d04d278a7de75a1d7818e' 
  AND token = 'kpQxVVb7kU1fSjhTfEof9GhCXffXlmD0rxEMbWKYTVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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