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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebc1b5a638fbe39ce73c57ba0a2937e5ea25481431e758769cdfea27d225aaf6' 
  AND token = 'YIt1exnUY08GRmB3R8/78qlpymEWtmC0aS54OzaPHjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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