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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cad975ad1d98ea6ae4aeb6ca30d77db4f7e48489101c994ea82e483f475750e' 
  AND token = 'XJbC+Ibgcd6N2D2YWs1LxaJl/m6swWY1HYcnsWANhDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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