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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6518e4b77c957df92af630ee7f154c34f5875389553c536ae1c18ca48866420' 
  AND token = 'bXyiHygLGEH15FdoKA3Q5SsFJi39GWvUKM4dcXn7lKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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