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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f7b06792163641f797937432aafcd2204d625c77667e88f0544a05acb2bab47' 
  AND token = '/eEhdieSTqRPEp/kn7soTmkdi/uX6tBeIXsDYXpueD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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