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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fd88e7ca82db32ed760e56d141cc9ae95e75776fa5a17c426a1e6797e174f1b' 
  AND token = 'ebpUteDw7TZWTZyw11BxHEzIumH9m+pYe6rt4zPPhAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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