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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eabfd52716ea269a702a62015868587f43056820256ebefcb0f8d4c9e6950a5' 
  AND token = '4u+74Om5QsNYEg4NZIRUqA5Q+Isojz2McZ/PaVfWL6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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