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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83fdea6af3907608513d1c1cc1f01c8a2bffe01f06b51a5f1164de01d9dd2167' 
  AND token = 'z+8D0cnQI/lfvPwxtbux2jAQId1CxvL8DzypnJQo5iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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