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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c78c88d0590370ba93b315e75a0b76de11ef95ab1c22402843ff0fa2000e01a0' 
  AND token = 'BU4rK5OA6Ys1pIKL04mjAh/ynVx1yI07W+76SXX6ODs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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