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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbeeb6b0577e5d60da33bf6fe52127f145e63789ee0deb4733c828b6a58c4972' 
  AND token = 'JAta535088RJOIb27PpBUqdG2kWZoa59dk1aX4R4YFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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