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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddb4072e47950a266763522bd36f571733369202ff85769bc3cffaf27a4eb52b' 
  AND token = 'bJHjC2IH5DLEnx5ANfAeDqvh34Ua+RcStz5trpXCgsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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