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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96bdceeb9c826c1db4ec311caf0d6081ef35a279dd6d0b434e0bc8bdac3e7d89' 
  AND token = 'dMPm6iok+nDcPdoRV4WXXcaTflzFc0Lhla+U68q13VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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