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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '050d9bf878e9e64a1554e69db3e8c7a1d2fe5c2421c47c7e4f55b1ac4ab41d9e' 
  AND token = 'l2RYBFgREbDe0pq8krMT8uYLQ1Y0YUgkJDvthI9xfFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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