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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d21e3843a440bd447bd5d61acec99acd5da3ad902384dbaaec18f25b89f7e21' 
  AND token = 'yTf8mvC9IDKQQ6e//tqWqlJ5QcP/QoWwDxJ/haM2qAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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