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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '012ba2747a1e8ffdff5e343726c6c712e63c4b21b0302a1c87e2b908f31c9135' 
  AND token = 'RqsJpjcSb6q5MkszwcxRPaUItSEejTfxqcoAbEBT8fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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