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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86c236c89a6ce5abb0152d0a91e8f630e330acb4d692fde8d01908f715d4383c' 
  AND token = 'HIvNThoFmHLUuOcMpJAAOtv+YMSiP4NytJJhOAyNrvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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