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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca1536bd1a3c34a690b02de4effd00b2d2d7fccee1c19a18ce1d7768aae7900f' 
  AND token = 'rpoBU8KDeMBYduj4jBon1c8bwyucM3dhxNww/Ta/DCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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