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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcf6487a04b16aca139ad7626e5577d848f568ea9e7cb110e836da264f2b92bc' 
  AND token = 'dE3Pqrwo/yhrDidpmdsI/rV4WaEh63IjhIj9MHKdE+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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