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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ff69aa2ad321617c408459939db210cfba181f2b41ea0deb8997408cd34637e' 
  AND token = 'to9gEJIR9Uz5prHUiaDgm7Eq6AoDvRlTD0D1ETunh+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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