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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9f3fe4e8a22eea1cd30b565345c4312203f0ebe7ddfa15818df48f7476c71ee' 
  AND token = 'L80mQYWxMou/lnS5H7wnljMBQxiJ47V458x82spLbLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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