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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f04fa94963d38d0ec54d48e02b38361b07b05fcd00a05c74f6925342d684e0cb' 
  AND token = 'Ea0uMyc1M0nKHmZt3SZxMBo9q47WfcSm5azJA6eof3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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