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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ed736907c5550611de06149ef178838f2e6727ca57e3ca188ee908644c7866' 
  AND token = 'Iq5VAAel8CFoj5Z8vngnHlDj14vR8LEzdf0LViA5v1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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