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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81d747e9b2014e12dff21935102c55549cb2d50871929d5688e864704f7c3d44' 
  AND token = 'lB/4CXoVNXvDA91Mb5J+IUx8Vb4xFHBR9k9w4OybDRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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