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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c22f29414214fd90de52cd88787546598c9ec6760e19fbb1de061da5ed860e2' 
  AND token = 'i1cTcptuvNCIWqLNSSqM/NF2yQdZiSMmN2yn9V16du8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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