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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b76cbe569b5ce18848bdad5950f6c6745cfe20baf8ba9b0565ec34e4864bd67' 
  AND token = 'cF1RHaI2FGxDw8qKeQ+MacMo+dN+KrJfvxmoiI+juZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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