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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d0f32ad2b3f6c42a41f57b53e92a565f1b53aa2ae75d340ed56bdd40c8656ef' 
  AND token = 'kvROCfMNlSC4gVz47FadsTLePgNm9BH1NtAckfMU6zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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