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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b0e764d3fd9c7a0d6cb87b9f2a8cca00ca4b76ffb7342d200fbfa89b10e127c' 
  AND token = 'b50JgubhXw1B7090mfSn8iyJqcIowBbb3X1AbbBwMog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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