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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e71613668b06364e5bc9675523450242f015cb7e0a627bf723c1d6adf1a1c27b' 
  AND token = 'kICj6HPrlep0FU2U6BgdI4z/jBdENjUFmlGO7kEhNUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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