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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13503b289bece75e1f3b88a3d17af7eaa0f17b896ae212b9d23df769caecea34' 
  AND token = 'OKou348TFgVSIb+A5egECQ9ABYBQwgrks+GFYy4Gr6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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