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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cc6ad7b703452efff7d7d7bd35857294a24f31c8389113246331e9c5549b070' 
  AND token = 'y0VYPHwot/77acvmdU7jf/MVS3lD7VVhO2OwMNjF7VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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