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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3fa3f0587518b21ee855bb0756e4d986bcc8fff03619000fee84c340a4d1a04' 
  AND token = 'FZQeNbyCcIvHz6kB6O5Bn4pw69paSrE1Zk00wJWnorE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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