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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '175c67058feb72ac9b3a03092d474e865c4be095775123fce92016e6005265f5' 
  AND token = '9BnSL9P/+6cfUR9gJf7/G1bOaC94aMsAWo+0rPu5ca0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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