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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f015a168e43bd74b4e761921baa52c7a70a08f092e41a50a53b1c29a9dc0181b' 
  AND token = 'JEzQKhpLeXjJMs3EifZpxd1Du6DzDp/Mc4K1MWZl1Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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