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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea16817b65e99eaec37bff7e9c9974ef733f821c3e20475aa21bceb49b4ccea3' 
  AND token = 'yffdRmAiJ40Qjql7vGfwnS9qrRaPfvu/VitHwUq/Rvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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