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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '578772dd9e68eecd3414cc5eb4434519cdb964826bb73b6bb63c619016965fdf' 
  AND token = '6vH+Xv/H62OIH80WDhVWw52LKonbfe7JLoTXrH2hT2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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