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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8c1c4dce6de2307f64e486920f756ef7a7b04c6e9286b0c87e64a2918550858' 
  AND token = 'aey3lQhNVP3z6DM1xWNORYnHCETXGgQvn7ns4BO4BHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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