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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c726882cb30ca31707043d00c54eae13523270cf85df96e9edea2b8c4dc3134' 
  AND token = 'z9XKqrQ2XeNtsMyzOI4z+QUfPrtAOzHd+G0Lprkog7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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