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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad89324424a70d4ae3797a579a6d166a3acdcfe77035ab173d09fef39601bd64' 
  AND token = 'V/k6Gx5c7RDILGyl2yOoxTE3OHXGMQlEVy4FfQRHwmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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