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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2d0bca8e457fa5dbd8537935c702a4bf96f6ac7bade308dc3b9c0822450d098' 
  AND token = '7GqIoww+rDMwm+71EkBnPig6SOJ3wzCN/0E5e0CWWOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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