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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e9f79e79bb7017cede2ef960f675774b04d3216ed84c1af90c0ff95b618a5a8' 
  AND token = 'cSy6S7iJhMtr2JGopv4gbTFd6exI7C/4qMopsXbHRKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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