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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b604ed1d29497b1229477c2735306bd7bb19eb697b99a89a7a2f20f24ef8212f' 
  AND token = 'XYiWYYa8wu7kSznbure9xLXjdwxhpn3O4/qvdapqVeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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