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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc679fcb501f27fd2f1c4ebc5ddc83734d41c8db6f1ddfb8cb405794997ec034' 
  AND token = 'Jz/j4CVwodL1gif98VNxajaE4a5kcF3LV7eOwbBwghU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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