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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c0b99070ada271336d3475f5a6826518aed7ef163c16d167671caeb0ebffe4f' 
  AND token = 'V6aFtNcb5EzChqG7GEIs9zTS0pcKdP7e7ccJNe7h/Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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