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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2c27786a7cb87450375c03683557b851e5d8a3ea05400ac25aa74ccb5ba01f' 
  AND token = 'o6fkGwdMZfWvXYzp63DOBvATzg7lWtGT83qMGDcu31c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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