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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4567db824a2f8918fa1fa567ac90400da35a0d9ee2bd8937ee6832a0717f6cd5' 
  AND token = 'osQB5cBhpm0umk+stdbk0W4Jds/nIqWfWdsjYwq9CS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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