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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a868028db15ba13e10efdb7614a93c43e4b934d5c01c243809bd1e7f822a6d' 
  AND token = 'Xv5fgiCiW3DarAH4ZYj8gl463oTYnoKenkpVpiEl/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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