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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc383c41acc5a66322b2553b8c8c9f8507df0a59cc3138e29816cda8c3c389db' 
  AND token = '9IAfeM2cgC6lJjs2BdLxsKXTHYp+swGipNmDf3yJG9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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