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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd5ee3d9a4a24a3ec1a3bbcf784a5e8288fb04b6385a34c6da1e65473200a406' 
  AND token = 'i3yeBtN3QKJlbYj0j8p2eqETkQp1rHf2uCQ4dW9KZPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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