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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f594c9c5c1c83e3bbd0bd7fdcc98130face17597a484ed14a5b404116f3fab04' 
  AND token = 'KpDUc9N6ScFPd6jkoW7U38og6LnwQEMLB5Knuvv8PT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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