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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1130e6c5a5dd56c07ff6fa73042e36e656cd4bc29cdcb80d2c9ea1d49298a1d' 
  AND token = 'FXcdJ+U29ByF/6m+UTDLbRkSmh9UF6Sb2SW8Vgw2WiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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