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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7402521aa1fbf415954554b74d8336bc534de009b18e3a5bb0653e52676e828' 
  AND token = 'YBc4nZa3o4imYWOMiLoh6oRUm9j2e0MUoWZvhpvqCwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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