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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98e631f5e2694a0a6f925dac5038064423230c3d6f80660378c0bf3d9c361a78' 
  AND token = 'O9hvWeokPUTUuPTN8xN8a0I4QUFgWmbCWMk4omYBVOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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