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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '437017fc56c93d35cb9656b686954174af330911df49f7ff1e3d3a18cc6c3016' 
  AND token = '0H7U+vXn+xW/QkYgW3ggPQcZUzbgrggkJ/6EfF+B7dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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