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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b91e6ba76acca0447f20d5e78af49a9d868e477bd3681bd763a392ace32f7058' 
  AND token = 'upMqB8RPKS//SrEayEKoC13vujdGmm8M7kH2j5m+ieA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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