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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a167f63f9fae72e8e8cfa285725441a2a59a9e1950e31d10fec1625f85436094' 
  AND token = 'OH/IT25F7jEImim6pk51gQsKbL4Q2iu8jmJYJy6PXWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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