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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35b8ee1ae05220c520e0090d6158c668aec4b29658e308c97c23b715efcaa069' 
  AND token = 'oYPE86YnCAhPw0cke3z4f6gFNrl+RXhcSiNcixFmMBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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